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<br /> <br />) <br /> <br />It is not economical to construct a flood control system that <br />will withstand and contain all high water events. Instead, flood <br />control systems are designed and built to withstand high water <br />events based on calculated risk factors. This may mean that <br />expedient flood works are required on top of existing levee <br />systems to withstand flood events greater than the design of the <br />original containment system. In reality, this requires constructing <br />expedient flood works over miles and miles of levees under <br />difficult conditions. In most flood fights, the goal is to have two <br />feet of freeboard on all flood works based on the predicted river <br />crest. The freeboard is the amount of space between the water and <br />the top of the flood control structure or works. <br /> <br />Notes <br /> <br />Water Leve <br /> <br /> <br />I <br />'C <br />"- <br />ltl <br />o <br />.c <br />QI <br />l!! <br />u. <br /> <br />) <br /> <br />Water Control <br />Structure <br /> <br />Expedient flood control works are temporary projects designed <br />to hold back floodwaters. Typical expedient flood control works <br />include sandbag lines, expedient levees, flashboard, mudboxes, <br />and similar items. More information on expedient flood protection <br />can Defound m later umts ot thIS course. <br /> <br />Floods are dynamic events that affect all waterways. When <br />floods occur, they can disrupt activities over thousands of square <br />miles and leave devastation in their wake. Since flooding is so <br />prevalent and costly in the United States, every community should <br />be prepared to deal with the effects of a high water event. <br /> <br />) <br /> <br />Page 1 - 9 <br />